Understanding the Anomalous J–V Curves in Carbon‐Based Perovskite Solar Cells as a Structural Transition Induced by Ion Diffusion - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Solar RRL Année : 2024

Understanding the Anomalous J–V Curves in Carbon‐Based Perovskite Solar Cells as a Structural Transition Induced by Ion Diffusion

Résumé

The investigation of hole transport layer‐free mesoporous carbon perovskite solar cells by analyzing current–voltage ( J – V ) curves under different scan rates, light intensities, and temperatures is presented. A distinctive bump in the curves is identified, previously reported in the literature. The voltage at the inflection point of this transition shows a linear correlation with the scan rate, directly yielding a characteristic relaxation time. Increasing temperature demonstrates a reduction in the magnitude and characteristic time of the bump. It also indicates an activation energy of 0.8 eV, suggesting a diffusion mechanism. Importantly, the intensity of the illumination has no influence on the overall behavior, indicating that the phenomenon is not a photovoltaic processes. It is proposed that the bump originates from transition between a metastable state at high scan rates and a stable one reached after relaxation. To accurately replicate the measured J – V curves, a novel lumped circuit model is introduced and validated. A schematic microstructural model depicts the reversible reduction in photocurrent as a decline in charge transfer capacity caused by the diffusion of large ions at the mesoporous titanuim dioxyde interface. Ultimately, this study also suggests a plausible reason for the well‐known hysteresis commonly observed with perovskite solar cells.
Fichier principal
Vignette du fichier
Solar RRL - 2024 - De Moor - Understanding the Anomalous J V Curves in Carbon‐Based Perovskite Solar Cells as a Structural.pdf (5.33 Mo) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Licence : CC BY - Paternité

Dates et versions

hal-04402188 , version 1 (18-01-2024)

Licence

Paternité

Identifiants

Citer

Gilles De Moor, Nicolas Charvin, Cynthia Farha, Toby Meyer, Lara Perrin, et al.. Understanding the Anomalous J–V Curves in Carbon‐Based Perovskite Solar Cells as a Structural Transition Induced by Ion Diffusion. Solar RRL, 2024, pp.2300998. ⟨10.1002/solr.202300998⟩. ⟨hal-04402188⟩
49 Consultations
10 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More